Tetralogy of Fallot – Pre and Post Repair Echocardiogram Tetralogy of Fallot is the commonest cyanotic congenital heart disease in the adult. Large subaortic ventricular septal defect with
Cyanotic spells are episodes of worsening of cyanosis (also called hypercyanotic spells, Tet spell for short) in infants with cyanotic congenital heart disease with low pulmonary blood flow
Catch 22 syndrome or 22q11 deletion is likely if there are dysmorphic features and arterial anomalies in TOF like right aortic arch and PA branch stenosis.